Particle identification using the angular distribution of transition radiation

Manifestation of the effects of dynamic diffraction in the coherent X-ray radiation of relativistic electrons in a periodic layered medium

“…The first experimental and theoretical studies of RTR in periodic layered media were presented in [2][3][4][5][6][7][8][9]. The experimental works [7][8][9], in which RTR spectra were measured with great accuracy, agreed well with theoretical calcu lations. Beginning approximately in 1985, interest in RTR grew because of the possibility of its use as a new source of convertible coherent radiation in the range of keV photon frequencies.…”

“…The closeness of the denominator in (8) to zero corresponds to the physical condition for the appearance of the PXR reflection in the case of which the real part of the wave vector of the pseudophoton of the relativistic electron Coulomb field coincides with that of a free photon; i.e., in the case where the bound photon becomes free. The equality of the denominator in (8) to zero determines the frequency in the area of which the spectrum of PXR photons emitted at a fixed observer angle is con centrated.…”

“…Curves describing the spectral PXR density of the relativistic electron for different values of the ratio b/a constructed using formula (8) are given in Fig. 8.…”

“…Because the W and C layer thicknesses are determined by the parameters b and a, respectively, a smaller ratio b/a corresponds to a smaller average density of the medium for the fixed structure period T = a + b. Using formulae (8) and (1a), we construct curves (Fig. 10) describing the spec tral and angular PXR densities for the observation angle corresponding to the angular density maxi mum.…”

Observation of soft-x-ray spatial coherence from resonance transition radiation

“…Cherenkov detectors have been used for such a purpose to determine the proportion of various species (e.g. , e versus n) [23,24]. A RTR detector would be more compact and easily inserted into the beam without major beamline construction.…”